code: def _simulate_img(affine=np.eye(4)):
      """Simulate data with one "spot".
  
      Returns: img, data
      """
      data = np.zeros([8, 8, 8])
      data[4, 4, 4] = 1
      img = Nifti1Image(data, affine)
      return img, data
  
imports: import base64
  import warnings
  from io import BytesIO
  import numpy
  import pytest
  from matplotlib import pyplot
  from nibabel import Nifti1Image
  from nilearn import datasets, image
  from nilearn.image import get_data, new_img_like
  from nilearn.plotting import html_stat_map
  from ..js_plotting_utils import colorscale
label_desc: Use image node_id 2 for calling a global function with example usage: _simulate_img(affine) and returns: img,  data